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Is it better to set default to Null for a certain field in the database table, or '', or Empty String? On the mobile phone, I just want to return empty

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Release： 2016-08-31 08:41:07
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When a certain field in the database is set to Null, the mobile terminal will return Null by default. If I want the mobile terminal to return null, I have to make a judgment.
1. If I want the mobile phone to return empty without making any judgment, how should I set the table field default?
2. Is it better to set the table field default to Null, "", or Empty String? Are they different?

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